Washington, D.C. 20549
Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
(Amendment No.    )

Filed by the Registrant  x                   Filed by a Party other than the Registrant ¨   
Check the appropriate box:
Preliminary Proxy Statement
Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
Definitive Proxy Statement
Definitive Additional Materials
Soliciting Material Pursuant to §240.14a-12
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
Payment of Filing Fee (Check the appropriate box):
No fee required.
Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
Title of each class of securities to which transaction applies:
Aggregate number of securities to which transaction applies:
Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
Proposed maximum aggregate value of transaction:
Total fee paid:
Fee paid previously with preliminary materials.
Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.
Amount Previously Paid:
Form, Schedule or Registration Statement No.:
Filing Party:
Date Filed:

One Plexus Way
P.O. Box 156
Neenah, Wisconsin 54957-0156
To the Shareholders of Plexus Corp.:
The information contained herein supplements the definitive proxy statement of Plexus Corp. (“Plexus”), which was filed with the Securities and Exchange Commission on December 14, 2015, relating to the annual meeting of shareholders to be held at the Milwaukee Marriott Downtown, 323 East Wisconsin Avenue, Milwaukee, Wisconsin 53202, on Wednesday, February 17, 2016, at 8:00 a.m. Central Time. The Board of Directors continues to recommend that shareholders vote:
FOR each of the nine nominees for election to the Board of Directors;
FOR the ratification of the Audit Committee’s selection of PricewaterhouseCoopers LLP as Plexus’ independent auditors for fiscal 2016;
FOR approval of the Plexus Corp. 2016 Omnibus Incentive Plan; and
FOR approval of the compensation of Plexus’ named executive officers, as disclosed in the proxy statement.
Plexus has engaged D.F. King & Co., Inc. to assist in the solicitation of proxies and to provide informational support and analysis for $12,500 plus expenses.
As a reminder, if for any reason you desire to revoke a submitted proxy, your proxy may be revoked at any time prior to the annual meeting by submitting a duly executed proxy bearing a later date (including via by entering your personal 16 digit control number), by written notice filed with the secretary, or acting secretary, of the annual meeting or by oral notice to the presiding officer during the annual meeting. If a broker, bank or other nominee holds your shares and you wish to change your proxy prior to the voting thereof, please contact the broker, bank or other nominee to determine whether, and if so how, such proxy can be revoked.
Your vote is important. Plexus appreciates your support.
By order of the Board of Directors

/s/ Angelo M. Ninivaggi______________________________________
Angelo M. Ninivaggi
Senior Vice President, Chief Administrative Officer,
General Counsel and Secretary

Neenah, Wisconsin
January 28, 2016